Benchmarks: AMD64 vs i386 on Dual 246 Opteron
obrien at freebsd.org
Tue Aug 2 18:13:57 GMT 2005
On Tue, Aug 02, 2005 at 10:59:41AM -0700, ray at redshift.com wrote:
> Thanks David - needless to say, I'm going to be re-running all my benchmarks
> I'll post my results when I have another machine in here and re-run the exact
> same benchmarks. This time I will be certain to confirm the situation on the
> SMP kernel with regard to the AMD64 branch.
You need to be careful about what you are testing.
If you dual-boot 64-bit and 32-bit from the same disk, don't forget one
of them will be on a faster area of the disk. So you need a 2nd data
disk that is newfs'ed between each run to do your benchmarks on.
At a minium, you should build a set of 32-bit binaries on FreeBSD/i386
with CPUTYPE=k8. Run benchmarks under the 32-bit OS.
Then run the same benchmarks with the 32-bit binaries on the 64-bit OS.
(ie, you're just changing the kernel).
Then build 64-bit binaries and benchmark them.
You should use RELENG_6, not 5.x to make sure you're getting the best K8
GCC we support along with the optimizations we've added since 5.x was
-- David (obrien at FreeBSD.org)
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